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Switzerland, officially the Swiss Confederation, is a landlocked country located at the convergence of Western, Central Southern Europe. Switzerland's natural landscape is marked by its numerous lakes and mountains, geographically divided among the Swiss Plateau, the Alps, and the Jura.

Sofia, 1 May 2011. In order to protect endangered sturgeon species, Bulgaria decided to ban sturgeon fishing in May 2011. Romania was the first country to implement a sturgeon fishing ban in the Danube in 2006 and is now followed by its southern neighbour.

Organic pollution has been on the rise in the Danube over the last century, as human activities have resulted in increasing loads of wastewater rich in organic matter. The most serious organic pollution problems occur in tributaries that regularly receive untreated or inadequately treated wastewater from industrial plants and municipalities. Thanks to the significant improvement of wastewater infrastructure and services in the Danube countries, the basin-wide organic emissions reduced by 60% since the mid 2000s.

The territory of Bulgaria is 110,912 km². The country is characterized by a rich diversity in morphological, geological, geomorphological, hydro-climatic and soil-biogenic aspects.